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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>使用构造函数调用函数</title>
</head>

<body>
    <p>该实例中， myFunction 是函数构造函数:</p>
    <p id="demo"></p>
    <script>
        function myFunction(arg1, arg2) {
            this.firstName = arg1;
            this.lastName = arg2;
        }
        var x = new myFunction("John", "Doe")
        document.getElementById("demo").innerHTML = x.firstName; 
    </script>
</body>

</html>